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/*
* Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
*
* This file is part of nios2sim-ng.
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include "nios2sim-ng.h"
#include "instruction.h"
#include "nios2.h"
/*
* J-Type instructions
*/
uint32_t call(struct nios2 *cpu, uint32_t opcode)
{
J_TYPE(instr, opcode);
return PC_INC_BY_INSTR;
}
uint32_t jmpi(struct nios2 *cpu, uint32_t opcode)
{
J_TYPE(instr, opcode);
return PC_INC_BY_INSTR;
}
/*
* I-Type instructions
*/
uint32_t ldbu(struct nios2 *cpu, uint32_t opcode)
{
I_TYPE(instr, opcode);
return PC_INC_NORMAL;
}
uint32_t addi(struct nios2 *cpu, uint32_t opcode)
{
I_TYPE(instr, opcode);
/* rB <- rA + IMM16 */
cpu->gp_regs[instr->b] = cpu->gp_regs[instr->a] + (int16_t) (instr->imm16);
return PC_INC_NORMAL;
}
instruction_handler i_type_inst_handlers[I_TYPE_COUNT] = {
[CALL] = call,
[JMPI] = jmpi,
[LDBU] = ldbu,
[ADDI] = addi,
};
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